On a walk that we took in the mountains (about 1000m - 1500m) of the Verdon National Park in France, in February, in several places we saw a clump of what looked like light green leathery shells. They looked a bit like pumpkin seeds or big lentils. They were about 1cm in diameter. Sort of disc shaped. In a clump there may have been 30 or 50 of these "shells", loosely stuck together in a kind of clear slime that looked a bit like saliva. Some of them appeared to be opened that is two halves (upper and lower) of the disc had split away from each other. Often they were lying on gravel in the sun and were not hidden under any vegetation.
I regret that I did not take a photo. I have searched the internet looking for photos of lizards' eggs, as I thought this is what they might be. However I am not at all sure. If you have any wildlife expert who could tell us what these might have been I would be very grateful.